How to remember the size and location of a UserControl, instead of a Window.

Hello All,

I have a UserControl object that I instantiate and assign to a Window at runtime. I know how to remember the size and location for Window objects, as per this link:

http://www.thomaslevesque.com/2008/11/18/wpf-binding-to-application-settings-using-a-markup-extension/

Problem however is, that the user control only has Width and Height properties and not Top and Left such as a UserControl. 

How do I thus remember the location and size of a UserControl, so that the next time the user opens the app, it will be the same size and in the same location as when he closed?

Thanks.

Harriet